Learn Dutch: Dat besluit over de stemming valt te begrijpen. - That decision about the vote is understandable.

The combination vallen te + infinitive is used to express that something is possible or can be done. Here, valt te begrijpen translates to 'can be understood' or 'is understandable.' It is a slightly more formal, idiomatic alternative to using the passive voice like kan worden begrepen.

Since this lesson focuses on function verb structures, how does the noun besluit tie into that?

Although besluit (decision) is simply the subject here, it is the exact same abstract noun you use in the formal structure een besluit nemen (to make a decision). Recognizing abstract nouns like this is key to mastering B2 Dutch, where they frequently replace standard verbs like besluiten (to decide).

Could I use beslissing instead of besluit in this sentence?

Yes, you could say Die beslissing over de stemming valt te begrijpen. Both words mean 'decision.' However, besluit is generally a bit more formal and is heavily used in official or political contexts, which perfectly fits a sentence about a vote (stemming). Remember that besluit is a het-word (dat besluit), while beslissing is a de-word (die beslissing).

I know stemming as 'mood' or 'atmosphere.' How do I know it means 'vote' here?